(CNN) - Rick Santorum's convincing win in Louisiana's GOP primary does little to change the delegate math that has rival Mitt Romney with a more than 2-to-1 lead, raising questions about whether he can generate broader appeal to win the nomination.

Santorum told supporters after Saturday's win in Louisiana that the race was far from over, recalling the naysayers who said Ronald Reagan was too conservative to win the nomination.

Detroit (CNN) – Mitt Romney and Rick Santorum opened up a new front in their battle for the Republican presidential nomination, this time over tactics, as Arizona and Michigan were voting in their primaries on Tuesday.

While 59 delegates are at stake - 29 in Arizona and 30 in Michigan - the bigger prize will be momentum.